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Second Opinion

AI fact-checking extension

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What Second Opinion is

Second Opinion is a fact-checking nudge for the browser: highlight a passage, invoke Grok, and receive accuracy assessments, bias flags and alternative viewpoints.

What you can do with it

  • Check suspicious claims quickly
  • Compare viewpoints on contested topics
  • Screen social media posts
  • Interrogate news framing
  • Build a verification habit

Who it is for

  • News readers sceptical by default
  • Researchers checking sources
  • Social media heavy users

What to watch out for

  • AI fact-checking is itself fallible; Grok has its own biases and errors, so this is a second opinion, not a verdict
  • You supply your own Grok API key and pay those costs
  • Highlighted content goes to the model provider; mind sensitive pages
  • Overreliance on AI checks can itself become a bias

Pros & cons

✓ What we like

  • Frictionless verification habit
  • Viewpoint comparison is useful
  • Free extension itself

! What to watch out for

  • AI checks are fallible
  • API costs on you
  • Content leaves the page

FAQ

Can I trust its verdicts?

No. Treat them as prompts to dig further, never as final judgments.

What does it cost?

The extension is free but you supply and pay for a Grok API key.

Does it work on all sites?

Most public pages; check behaviour on dynamic content.

Last reviewed: 2026-09-19

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